Why can’t zinc oxide and titanium dioxide simply be added to a water-based sunscreen gel? Understand why ingredient compatibility matters and why an ingredient that works in a cream or lotion may not work in the same way in a gel.
Why are water-resistant sunscreen balms often greasier and more visible on the skin? Understand why staying power can come with a richer texture and more noticeable white cast, especially when water resistance is the priority.
Why does some sunscreen leave a visible white layer on the skin? Understand how mineral sun-protection ingredients contribute to white cast and why an invisible finish isn’t the only consideration when choosing sunscreen.
